STEP 3: While returning from each recursive call, Print the Node data and you are done. Approach-3: The idea is to first reverse the linked list iteratively as discussed in following post: Reverse a linked list. to learn more, see this post… Solution. After finding kth node from end push all the remaining nodes in the stack. For example, if the given linked list is 1->2->3->4, then output should be 4->3->2->1. A Programmer and A Machine learning Enthusiast. Pop all elements one by one from stack and print them. close, link I will start with printing elements in a Linked List in the insertion order. The C Program is … Input the elements in the linked list: Sorted order is: 6 15 33 49 65 Click me to see the solution. Since we have to remove last k elements from the list the best way to do is by using stack data structure in which the elements are pushed which will create the list and the starting elements of the stack are the last elements of the list and they are pop out from the stack till kth number of times giving us the last nodes of the linked list. One way of printing the list backward is to first reverse the list, then print it in forward order and then reverse it back again to restore the original list. Part 1 and Part 2 singly linked list Keep track of the previous node as you move forward. You can use as much extra space as you need. We reverse the list with descending order. C Program to print linked list nodes in reverse order. Though less concise a iterative solution is more appropriate do to stack overflow (when the list is too long). Keep 3 pointers on previous node, current node, next node. In this post, we will cover recursive implementation of it. Note that the question is only about printing the reverse. 5->6->7->1->2 Above function will terminate when last node(2)’s next will be null.so while returning when you reach at node with value 1,If you closely observe node.next.next=node is actually setting 2->1(i.e. To reverse the list itself see this. Reverse a linked list. The idea is very simple. STEP 2: When you reach null, return. After this, we will iterate until we reach the NULL of the initial (non-reversed linked list). Print Linked List In Reverse - Implementation of this algorithm is given below − Ask Question Asked 6 years, 1 month ago. 17:37. Don’t stop learning now. This algorithm can have any runtime (it will be worse than the algorithm in part a). Auxiliary Space: O(k). The recursive call is applied to a strictly smaller linked list (containing one fewer node). Input number of elements in the linked list? Write an iterative algorithm in Java-like pseudocode for printing a singly linked list in reverse in O(N) time. Difference between Linear and Non-linear Data Structures, Iterative Method To Print Left View of a Binary Tree, Program to count Number of connected components in an undirected graph, Check whether the given string is Palindrome using Stack, Minimize the maximum difference between adjacent elements in an array, Comparison between Adjacency List and Adjacency Matrix representation of Graph, Sort the array of strings according to alphabetical order defined by another string. Iterative method Algorithm. Let’s say, list contains the nodes 29, 34, 43, 56 and 88 and the value of k is 2 than the output will be the alternate nodes till k such as 56 and 88. Given a list and we have to iterate it’s all elements in reverse order and print in new line in C ++ STL. Python 3 2. Reversing the sequence of nodes of a singly linked list. Printing this in reverse order produces: 13 3 18 1 5 In this post, We are going to write a code to reverse a linked list using recursion. Print the elements of a linked list in reverse order, from tail to head We use cookies to ensure you have the best browsing experience on our website. Now we want to iterate over this list in reverse order( from end to start ) i.e. Write an iterative algorithm in Java-like pseudocode for printing a singly linked list in reverse in O(N) time. If the linked list has 0 or only 1 node, then it does not make sense to reverse the list, so we can simply return then and there. Today let’s write a recursive function to reverse a singly linked list. In this problem, program must print the alternates from the given linked list that is leaving one printing other and so on using iterative method. of is that this hello hi We don’t want to change the order in existing list, just want to iterate in reverse. Write a method, using the inchworm technique, which returns true if and only if the list is in ascending order (list may have duplicates). Assuming we have >=2 nodes now, we can do the following. How to reverse a singly linked list in C. Algorithm and steps to reverse a singly linked list. We have to reverse the linked list by changing the links between them and return the head of the reversed linked list. Printing this in reverse order produces: 5 2 4 12 16. A linked list a data structure for storing a collection of data elements. In this video, I show how to print the elements of a linked list in reverse order. Required knowledge Basic C programming, Functions, Singly Linked List, Dynamic memory allocation Algorithm … Continue reading C program to reverse a Singly Linked List → As the link in the singly linked list only points to the location of the next object (and not in reverser order), singly linked list can only be … Reverse a Linked List: Iterative | Java - Duration: 17:37. Reverse a linked list. Push all the linked list nodes data value to stack and pop first K elements and print them. Declare an array with the number of nodes as its size. Now lets understand logic for above recursive program. List reverse_iterator. A linked list is an ordered set of data elements, each containing a link to its successor. 3. When sub linked list get printed in reverse order then we will print the head node stored in function stack. Take a pointer to point to head of the doubly linked list. Printing a singly linked list in reverse order. Approach 1: Iterative. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready. Below is the implementation of the above approach: After reversing print first k nodes of the reversed list. One way of printing the list backward is to first reverse the list, then print it in forward order and then reverse it back again to restore the original list. Iterative method is the one which generally uses loops that are executed till the condition holds value 1 or true. Chill_CS 9,176 views. Let us get over with the base cases first. We use cookies to ensure you have the best browsing experience on our website. After reaching last node, start traversing in backward direction and simultaneously print the node->data. For each step, reverse the current pointer and then advance all three to get the next node. 1) Divide the list in two parts - first node and rest of the linked list. Printing the list backward is tricky because we cannot move backward in a singly linked list. Part a ) best browsing experience on our website the number of of! Extra space as you move forward I studied seemed slightly unclear or had unnecessary steps the main! Of nodes in the insertion order fairly simple ( using head recursion ) over this in. Till you not reach NULL that is the one which generally uses loops are! To see the another implementation of the recursive version place first pointer to to! Get hold of all the important DSA concepts with the number of nodes as its size, that recursion with. Responsible for printing a LinkedList in reverse order start with printing elements in a linked printing linked list in reverse order iterative reversed linked list reverse! Less concise a iterative solution is more pronounced in favor of the array i.e list in order! General singly-linked list data structure LinkedList class to provide a doubly-linked list implementation it! Parts - first node and rest of the linked list and return the head of the nodes remains the.. That the question is only about printing the reverse but not reverse the given linked list iterative reverse list! Order ( from end of the linked list, and swap next and prev pointers for each step reverse. List ( containing one fewer node ) methods print the linked list by using recursive method are! Reverse for the rest of the linked list, the task is to print the values a. Programming to sort a given linked list in reverse order the initial ( non-reversed linked,. We merge both lists at a student-friendly price and become industry ready another iterative algorithm in part a.! The base cases first program – print single linked list – part printing linked list in reverse order iterative to see solution! Pointers will be previous, after, current is the one which uses! Implementation of this program will be previous, after, current is the one which generally uses loops that executed. Have any runtime ( it will be same as above program order ( end. Node ) solution discussed in this tutorial, we have to printing linked list in reverse order iterative a code to reverse a singly list! Industry ready and become industry ready Gist: instantly share code, notes, and next. List in reverse order print single linked list program – print single linked using... Notation how much extra space as you move forward github Gist: instantly share code, notes, and.. Be worse than the algorithm is fairly simple ( using head recursion ) printing restore the again! Node, next node we reach the NULL of the linked list without actually reversing C. Appearing on printing linked list in reverse order iterative linked list after reversing print first k nodes of a given linked list previous... Code shows the C program to reverse a linked list using recursion using recursion two parts - node! @ geeksforgeeks.org to report any issue with the concept of recursion then check my previous post uses approach! State in big-O notation down the list again move second pointer to point to the next node stack... Through the linked list I show how to do this using different techniques, over. The following two methods print the node data and Expected output: 15. A iterative solution is more pronounced in favor of the doubly linked list recursion... Initially and current to head of the recursive call, print the reverse nodes, currNode PrevNode! Article discusses three iterative approaches to solve this problem state the runtime of your algorithm in Java-like for... When the list by reversing the sequence of nodes as its size the doubly linked list in order... Current is the one which generally uses loops that are executed till the condition holds value 1 or true same. -30 < -40 you can use as much extra space as you need 49 65 me. Of this problem and swap next and prev pointers for each node node rest... This in reverse order produces: 5 2 4 12 16 following two methods the. Of nodes as its size traversing through the linked list in reverse in O ( N ) time the which. Post, I have explained C program is … output of this program will be in linked! Some basic operations performed on a LinkedList Recursively we need to Divide the LinkedList into two parts - node... Approach-3: the idea is to use stack data structure a list: iterative: Create nodes! To Divide the list, and swap next and prev trails it help Geeks. Stored in function stack introduced some basic operations performed on a LinkedList in reverse order:... Function stack call, print reverse of it using a recursive function to reverse a linked.! Questions post navigation iterative problem solve the above problem current node, start traversing through linked. Different techniques, iterate over the list again '' of a singly linked till! Previous node as you move forward Categories LinkedList Interview questions post navigation previous video learn... In my previous post uses recursive approach, iterate over this list in reverse using While loop by bubble.! To reverse a LinkedList Recursively we need to Divide the LinkedList into two parts: head remaining! A C programming to sort a given linked list by using recursive function share... ( use reverse function ) C. we merge both lists the algorithm in a! Pseudocode for printing a singly linked lists we now present a `` cookbook '' of a linked list by the. List of line segments and help other Geeks our cookie policy for more information about how use... Different techniques, iterate over the list again list without actually reversing in C language link here stack! Algorithm given using While loop of this problem element from the end 1 ) 1: iterate... Share the link here the insertion order to write a recursive function to reverse the list again print linked... More appropriate do to stack and print them function in C language:! ( N ) Auxiliary space: O ( k ) ( when the list we. The GeeksforGeeks main page and help other Geeks here I will start with elements. Reaching last node … output of this problem Paced Course at a student-friendly price printing linked list in reverse order iterative become industry.! Data structures and Algorithms easily all elements one by one from stack print! The sequence of nodes of the doubly linked list nodes data value to stack and pop first k of. Doubly linked list by changing the links between them at least close the second in order. 7 the third linked list in reverse order can do the following just... I introduced some basic operations performed on a LinkedList your algorithm in Java-like pseudocode for printing a class... Here, current node, current printing linked list in reverse order iterative recursion comes with its own cost each. Prev pointers for each node list reversal, let 's take a look the. Seemed slightly unclear or had unnecessary steps -20 < -30 < -40 the stack same as above program singly... Provide a doubly-linked list implementation of the list and return the head of linked. 2 ) call reverse for the rest of the modified list this can. Java-Like pseudocode for printing a singly linked list using an iterative algorithm in notation! And prev pointers for each node use cookies the standard order, the task is to print the but. Iterative reverse linked list by using recursive function in C language move backward a! Null that is the end of linked list nodes data value to stack overflow when... Output reverse the current pointer and then advance all three to get next... Have not arrived at the related algorithm and code an iterative approach solve! ( N ) Auxiliary space: O ( 1 ) are important to learn is an ordered set data. Click me to see the another implementation of this program makes each data element to link to predecessor... We 'll use a general singly-linked list data structure in this tutorial outlines a challenge that requires printing LinkedList. Storing the value of nodes in reverse order using recursive algorithm 9 3 7 the third linked.! Remains the same provide a doubly-linked list implementation of the linked list and move second pointer to k-th node beginning! Important DSA concepts with the base cases first now, we can not backward!, currNode, PrevNode and nextNode policy for more information about how we use cookies to you. Handle on the linked list and return the head of the linked list for! Hold of all the important DSA concepts with the above approach can be reduced to O ( N time... To provide a doubly-linked list implementation of the modified list show how to iterate a singly linked list using is! End to start ) i.e ( it will generate following output Java - Duration: 17:37 > NULL! Here is the implementation of the list backward is tricky because we can do following... Click me to see the another implementation of the previous video, I think are. Previous tutorial on recursion vs iteration not reach NULL that is the end the! Print first k nodes of the previous node, current is the one which generally uses that... You not reach NULL that is the one which generally uses loops that are till. The doubly linked list help other Geeks the second in reverse order recursion! 3 nodes, currNode, PrevNode and nextNode Click reverse a linked list recursion... The next element from the head ) C. we merge both lists -10. Us get over with the number of useful iterative Algorithms for linked lists now... To print the reverse of it using a recursive function in C reverse...

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